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    <title>Document</title>
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      var person = {
        name: '张三',
        age: 18,
        sex: 'boy',
        sayHello: function () {
          console.log('我是' + this.name);
        },
        speak: function () {
          this.sayHello();
          console.log('我正在说话');
        },
      };
      person.speak();
    </script>
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